Optimal cultivation concentration of duckweed for pollutant removal from biogas slurry

文献类型： 外文期刊

第一作者： Li, Jiaquan

作者： Li, Jiaquan;Gao, Ya;Xie, Yaoru;Li, Junyi;Ran, Cheng;Li, Jiazhou

作者机构：

关键词： Lemna aequinoctialis; Nutrient recovery; Wastewater remediation; Biomass and protein production; Swine wastewater

期刊名称：SCIENTIFIC REPORTS （ 影响因子：3.9； 五年影响因子：4.3 ）

ISSN： 2045-2322

年卷期： 2025 年 15 卷 1 期

页码：

收录情况： SCI

摘要： Duckweed is an important plant for wastewater remediation and a promising alternative protein source for animal feed. This study aims to evaluate the biomass, protein accumulation, and wastewater purification capacity of duckweed under controlled cultivation conditions. Using pig farm biogas slurry as a nutrient source, this study analyzes the purification ability of duckweed at different slurry concentrations (2%, 4%, 6%, 8%, 10%) on chemical oxygen demand (COD), total nitrogen (TN), total phosphorus (TP), and ammonia nitrogen (NH3-N) in biogas slurry. The study also describes changes in duckweed weight, chlorophyll content, and protein accumulation. Our results showed that a 4% biogas slurry concentration was the optimum condition for the cultivation of duckweed, which corresponded to an NH3-N concentration of 29.56 mg/L. The dry matter production capacity of duckweed under these conditions was 1.78 g/(dm2), the relative growth rate (RGR) was 0.29 g/(gd), the doubling time was 2.42 days, and the protein content was 36.25% by dry weight. In terms of pollutant removal, duckweed efficiently removed 54.69% of COD, 86.89% of TN, 97.25% of NH3-N, and 85.22% of TP. The results of this study provide an important reference for the operation of the duckweed production system, which is crucial for the design and operation of pilot-scale and large-scale duckweed production systems moving forward.

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